Assertion and Reason on Friction in Non-Inertial Frame – Rankers Physics
Topic: Laws of Motion
Subtopic: Friction

Assertion and Reason on Friction in Non-Inertial Frame

Assertion (A): A block is lying at rest on horizontal rough surface. A person moving with acceleration \(a\) in forward direction will observe a friction force acting on the block.
Reason (R): When there is relative motion between the two surface then only static friction acts between them.
 
Both (A) & (R) are true and the (R) is the correct explanation of the (A)
Both (A) & (R) are true but the (R) is not the correct explanation of the (A)
(A) is true but (R) is false
Both (A) and (R) are false

Solution:

In an accelerating (non-inertial) frame, a pseudo-force acts on the block, requiring a forward friction force. So, A is true. Static friction acts when there is no relative motion; kinetic friction acts when there is relative motion. Thus, R is false.

Leave a Reply

Your email address will not be published. Required fields are marked *